Update documentation for [Checkbox]

[2unbini]

Description

Add source codes of checkbox samples and edited 'Props' to fit with the checkbox interface.
Images below are some screenshots of the edited storybook.

One thing I ask for you is to check if the type of onPress is correct.
I referred to the interface, but I'm not that familiar to typescript so I'm afraid that I've wrote wrong thing 😅

Related Issues

#57

Tests

No test

Checklist

Before you create this PR confirms that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• Run yarn test or yarn test -u if you need to update snapshot.
• Run yarn lint
• I am willing to follow-up on review comments in a timely manner.

[codecov]

Codecov Report

Merging #90 (275f855) into master (b1049e7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   95.46%   95.46%           
=======================================
  Files          21       21           
  Lines         551      551           
  Branches      242      242           
=======================================
  Hits          526      526           
  Misses         25       25           

[hyochan]

Very well organized~! Looks great overall!

[hyochan]

@2unbini

For your question, currently it is onPress but I think we should change this props to onCheck and deprecate the onPress. Good point!

Also, next time you can try to make a commit message with a capital letter on the first word.

More about commit message is here.

[2unbini]

Oh I missed that part! Thank you for letting me know :)